diff --git a/Formatters/SecondsFormatter.h b/Formatters/SecondsFormatter.h
index 48a959170..443c7bb5d 100644
--- a/Formatters/SecondsFormatter.h
+++ b/Formatters/SecondsFormatter.h
@@ -24,4 +24,6 @@
 {
 }
 
+- (NSString * _Nullable)stringForTimeInterval:(NSTimeInterval)timeInterval;
+
 @end
diff --git a/Formatters/SecondsFormatter.m b/Formatters/SecondsFormatter.m
index 96d633924..3dbe0c66e 100644
--- a/Formatters/SecondsFormatter.m
+++ b/Formatters/SecondsFormatter.m
@@ -31,6 +31,11 @@
 	
 	NSTimeInterval timeInterval = [object doubleValue];
 	
+	return [self stringForTimeInterval:timeInterval];
+}
+
+- (NSString * _Nullable)stringForTimeInterval:(NSTimeInterval)timeInterval;
+{
 	if (isnan(timeInterval)) { return @"NaN"; }
 	if (isinf(timeInterval)) { return @"Inf"; }